Download Using Impedance Tuners to Extend the Agilent 8960 Beyond 50Ω

M A U R Y M I C R O W AV E
C O R P O R A T I O N
May 2009
Using Impedance Tuners to Extend the Agilent 8960
Beyond 50W
Introduction
Mobile phones must guarantee proper
functioning in non-ideal real-world
environments, such as a lost or damaged antenna, usage in a tunnel or locker,
being held close to the body or in a
pocket surrounded by coins, etc. Each
of these scenarios can be regarded
as non-ideal from an RF standpoint,
meaning non-50 ohm. We are able to
use a single tuner to vary the VSWR
magnitude and phase seen by the
antenna port of the phone and test its
performance in transmit and receive
mode.
Transmit Load Pull
The goal of load pull in the phone’s transmit mode
is to measure the output power as a function of VSWR
magnitude and phase. The Agilent 8960 Test Set is
used in signaling mode to establish a call with a mobile
phone, specify a channel/frequency (e.g., ARFCN 128 is
824 MHz uplink and 869 MHz downlink for GSM850),
set the power control level (e.g., PCL 5 is 33 dBm at
GSM850) and measure the power delivered from the
phone. Maury MT910 series software will vary the VSWR
and battery voltage as determined by the user and record
the output power de-embedded to the antenna port or the
FEM inside the phone. The software procedure is automated thanks to the use of a simple test sequencer which
allows the user to enter a list of channels/frequencies, battery voltages, VSWR magnitudes and phases.
Powered by Maury
AMTS
Automated Mobile Test System
Software
Receive Load Pull
The goal of load pull in RX mode is the sensitivitymeasurement of the phone; at what power level will a
user-specified bit-error rate (BER) be achieved, as a function of VSWR magnitude and phase. The Agilent 8960
Test Set is used in signaling mode to establish a call with
a mobile phone, specify a channel/frequency, and send
a low-power burst (in the order of -105 to -110 dBm) to
the phone and measure the resulting BER. Maury MT910
series software will vary the VSWR and battery voltage as
determined by the user, measure the resulting BER, and
vary the burst-power until the required BER is achieved.
33.5
-106.0
33.0
-106.5
32.5
-107.0
32.0
-107.5
31.5
-108.0
31.0
-108.5
30.5
-109.0
30.0
29.5
-109.5
29.0
-110.0
28.5
-110.5
Graphical representation of TX results
2900 Inland Empire Blvd. • Ontario, California 91764-4804
Tel: 909-987-4715 • Fax: 909-987-1112 • http://www.maurymw.com
Copyright 2009 Maury Microwave Inc., all rights reserved.
Graphical representation of RX results
application note
5C-080A
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Page 1 of 2
Maury MT910 series Automated Mobile Testing System Software
Conclusion
Maury Microwave Corporation, together with Agilent
Technologies, offers a simple, fast and cost-effective
solution tailored for mobile phone testing outside of
the 50W environment. This solution automates mobile
phone testing in TX/RX modes over a multitude of
channels/frequencies, battery voltages and power levels.
It works by combining:
• Maury's MT910 Series Automated Mobile Testing System software to
– control the system,
– de-embed VSWR and power levels to DUT
reference,
– control variable DC supply to mimic battery
voltages, and
– automate measurements
• a Maury MT98x Automated Tuner which sets
non-50W impedance
• and the Agilent 8960 Test Set which acts as
a base station, sets active channel and power
levels, and measures power and bit-error-rate.
5C-080A
application note
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Page 2 of 2
By analyzing the test results obtained using this solution
you can learn:
• What level of antenna mismatch is acceptable,
based on real-life testing against your VSWR
requirements
• If your mobile phone meets the minimum
performance requirements under pre-defined VSWR
and voltage conditions
• If your phone's performance degrades after a large
VSWR sweep plan
• If thermal stability issues exist
• If your phone's design is acceptable as is, or if
some components need to be redesigned
• If specific performance problems result from batch
manufacturing
These are just a few of the ways you can use Maury
MT910 AMTS software and ATS tuners to extend the
capability of Agilent's 8960 test set beyond the 50W
environment.
2900 Inland Empire Blvd. • Ontario, California 91764-4804
Tel: 909-987-4715 • Fax: 909-987-1112 • http://www.maurymw.com